The role of type I interferons in intestinal infection, homeostasis, and inflammation.

Type I interferons are a widely expressed family of effector cytokines that promote innate antiviral and antibacterial immunity. Paradoxically, they can also suppress immune responses by driving production of anti-inflammatory cytokines, and dysregulation of these cytokines can contribute to host-mediated immunopathology and disease progression. Recent studies describe their anti-inflammatory role in intestinal inflammation and the locus containing IFNAR, a heterodimeric receptor for the type I interferons has been identified as a susceptibility region for human inflammatory bowel disease in a genome-wide association study. This review focuses on the role of type I IFNs in the gut in health and disease and their emerging role as immune modulator. Clear understanding of type I IFN-mediated immune responses may provide revenue for fine-tuning existing IFN treatment for infection and intestinal inflammation.